/*
 * Copyright © 2015 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

#include "anv_private.h"

#include "genxml/gen_macros.h"
#include "genxml/genX_pack.h"

#include "genX_pipeline_util.h"

static void
gen7_emit_rs_state(struct anv_pipeline *pipeline,
                   const VkPipelineRasterizationStateCreateInfo *info,
                   const struct anv_graphics_pipeline_create_info *extra)
{
   struct GENX(3DSTATE_SF) sf = {
      GENX(3DSTATE_SF_header),

      /* LegacyGlobalDepthBiasEnable */

      .StatisticsEnable                         = true,
      .FrontFaceFillMode                        = vk_to_gen_fillmode[info->polygonMode],
      .BackFaceFillMode                         = vk_to_gen_fillmode[info->polygonMode],
      .ViewTransformEnable                      = !(extra && extra->use_rectlist),
      .FrontWinding                             = vk_to_gen_front_face[info->frontFace],
      /* bool                                         AntiAliasingEnable; */

      .CullMode                                 = vk_to_gen_cullmode[info->cullMode],

      /* uint32_t                                     LineEndCapAntialiasingRegionWidth; */
      .ScissorRectangleEnable                   =  !(extra && extra->use_rectlist),

      /* uint32_t                                     MultisampleRasterizationMode; */
      /* bool                                         LastPixelEnable; */

      .TriangleStripListProvokingVertexSelect   = 0,
      .LineStripListProvokingVertexSelect       = 0,
      .TriangleFanProvokingVertexSelect         = 1,

      /* uint32_t                                     AALineDistanceMode; */
      /* uint32_t                                     VertexSubPixelPrecisionSelect; */
      .UsePointWidthState                       = false,
      .PointWidth                               = 1.0,
      .GlobalDepthOffsetEnableSolid             = info->depthBiasEnable,
      .GlobalDepthOffsetEnableWireframe         = info->depthBiasEnable,
      .GlobalDepthOffsetEnablePoint             = info->depthBiasEnable,
   };

   GENX(3DSTATE_SF_pack)(NULL, &pipeline->gen7.sf, &sf);
}

static void
gen7_emit_ds_state(struct anv_pipeline *pipeline,
                   const VkPipelineDepthStencilStateCreateInfo *info)
{
   if (info == NULL) {
      /* We're going to OR this together with the dynamic state.  We need
       * to make sure it's initialized to something useful.
       */
      memset(pipeline->gen7.depth_stencil_state, 0,
             sizeof(pipeline->gen7.depth_stencil_state));
      return;
   }

   struct GENX(DEPTH_STENCIL_STATE) state = {
      .DepthTestEnable = info->depthTestEnable,
      .DepthBufferWriteEnable = info->depthWriteEnable,
      .DepthTestFunction = vk_to_gen_compare_op[info->depthCompareOp],
      .DoubleSidedStencilEnable = true,

      .StencilTestEnable = info->stencilTestEnable,
      .StencilBufferWriteEnable = info->stencilTestEnable,
      .StencilFailOp = vk_to_gen_stencil_op[info->front.failOp],
      .StencilPassDepthPassOp = vk_to_gen_stencil_op[info->front.passOp],
      .StencilPassDepthFailOp = vk_to_gen_stencil_op[info->front.depthFailOp],
      .StencilTestFunction = vk_to_gen_compare_op[info->front.compareOp],

      .BackfaceStencilFailOp = vk_to_gen_stencil_op[info->back.failOp],
      .BackfaceStencilPassDepthPassOp = vk_to_gen_stencil_op[info->back.passOp],
      .BackfaceStencilPassDepthFailOp = vk_to_gen_stencil_op[info->back.depthFailOp],
      .BackFaceStencilTestFunction = vk_to_gen_compare_op[info->back.compareOp],
   };

   GENX(DEPTH_STENCIL_STATE_pack)(NULL, &pipeline->gen7.depth_stencil_state, &state);
}

static void
gen7_emit_cb_state(struct anv_pipeline *pipeline,
                   const VkPipelineColorBlendStateCreateInfo *info,
                   const VkPipelineMultisampleStateCreateInfo *ms_info)
{
   struct anv_device *device = pipeline->device;

   if (info == NULL || info->attachmentCount == 0) {
      pipeline->blend_state =
         anv_state_pool_emit(&device->dynamic_state_pool,
            GENX(BLEND_STATE), 64,
            .ColorBufferBlendEnable = false,
            .WriteDisableAlpha = true,
            .WriteDisableRed = true,
            .WriteDisableGreen = true,
            .WriteDisableBlue = true);
   } else {
      const VkPipelineColorBlendAttachmentState *a = &info->pAttachments[0];
      struct GENX(BLEND_STATE) blend = {
         .AlphaToCoverageEnable = ms_info && ms_info->alphaToCoverageEnable,
         .AlphaToOneEnable = ms_info && ms_info->alphaToOneEnable,

         .LogicOpEnable = info->logicOpEnable,
         .LogicOpFunction = vk_to_gen_logic_op[info->logicOp],
         .ColorBufferBlendEnable = a->blendEnable,
         .ColorClampRange = COLORCLAMP_RTFORMAT,
         .PreBlendColorClampEnable = true,
         .PostBlendColorClampEnable = true,
         .SourceBlendFactor = vk_to_gen_blend[a->srcColorBlendFactor],
         .DestinationBlendFactor = vk_to_gen_blend[a->dstColorBlendFactor],
         .ColorBlendFunction = vk_to_gen_blend_op[a->colorBlendOp],
         .SourceAlphaBlendFactor = vk_to_gen_blend[a->srcAlphaBlendFactor],
         .DestinationAlphaBlendFactor = vk_to_gen_blend[a->dstAlphaBlendFactor],
         .AlphaBlendFunction = vk_to_gen_blend_op[a->alphaBlendOp],
         .WriteDisableAlpha = !(a->colorWriteMask & VK_COLOR_COMPONENT_A_BIT),
         .WriteDisableRed = !(a->colorWriteMask & VK_COLOR_COMPONENT_R_BIT),
         .WriteDisableGreen = !(a->colorWriteMask & VK_COLOR_COMPONENT_G_BIT),
         .WriteDisableBlue = !(a->colorWriteMask & VK_COLOR_COMPONENT_B_BIT),
      };

      /* Our hardware applies the blend factor prior to the blend function
       * regardless of what function is used.  Technically, this means the
       * hardware can do MORE than GL or Vulkan specify.  However, it also
       * means that, for MIN and MAX, we have to stomp the blend factor to
       * ONE to make it a no-op.
       */
      if (a->colorBlendOp == VK_BLEND_OP_MIN ||
          a->colorBlendOp == VK_BLEND_OP_MAX) {
         blend.SourceBlendFactor = BLENDFACTOR_ONE;
         blend.DestinationBlendFactor = BLENDFACTOR_ONE;
      }
      if (a->alphaBlendOp == VK_BLEND_OP_MIN ||
          a->alphaBlendOp == VK_BLEND_OP_MAX) {
         blend.SourceAlphaBlendFactor = BLENDFACTOR_ONE;
         blend.DestinationAlphaBlendFactor = BLENDFACTOR_ONE;
      }

      pipeline->blend_state = anv_state_pool_alloc(&device->dynamic_state_pool,
                                                   GENX(BLEND_STATE_length) * 4,
                                                   64);
      GENX(BLEND_STATE_pack)(NULL, pipeline->blend_state.map, &blend);
      if (pipeline->device->info.has_llc)
         anv_state_clflush(pipeline->blend_state);
    }

   anv_batch_emit(&pipeline->batch, GENX(3DSTATE_BLEND_STATE_POINTERS), bsp) {
      bsp.BlendStatePointer = pipeline->blend_state.offset;
   }
}

VkResult
genX(graphics_pipeline_create)(
    VkDevice                                    _device,
    struct anv_pipeline_cache *                 cache,
    const VkGraphicsPipelineCreateInfo*         pCreateInfo,
    const struct anv_graphics_pipeline_create_info *extra,
    const VkAllocationCallbacks*                pAllocator,
    VkPipeline*                                 pPipeline)
{
   ANV_FROM_HANDLE(anv_device, device, _device);
   struct anv_pipeline *pipeline;
   VkResult result;

   assert(pCreateInfo->sType == VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO);

   pipeline = anv_alloc2(&device->alloc, pAllocator, sizeof(*pipeline), 8,
                         VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
   if (pipeline == NULL)
      return vk_error(VK_ERROR_OUT_OF_HOST_MEMORY);

   result = anv_pipeline_init(pipeline, device, cache,
                              pCreateInfo, extra, pAllocator);
   if (result != VK_SUCCESS) {
      anv_free2(&device->alloc, pAllocator, pipeline);
      return result;
   }

   assert(pCreateInfo->pVertexInputState);
   emit_vertex_input(pipeline, pCreateInfo->pVertexInputState, extra);

   assert(pCreateInfo->pRasterizationState);
   gen7_emit_rs_state(pipeline, pCreateInfo->pRasterizationState, extra);

   gen7_emit_ds_state(pipeline, pCreateInfo->pDepthStencilState);

   gen7_emit_cb_state(pipeline, pCreateInfo->pColorBlendState,
                                pCreateInfo->pMultisampleState);

   emit_urb_setup(pipeline);

   const VkPipelineRasterizationStateCreateInfo *rs_info =
      pCreateInfo->pRasterizationState;

   anv_batch_emit(&pipeline->batch, GENX(3DSTATE_CLIP), clip) {
      clip.FrontWinding             = vk_to_gen_front_face[rs_info->frontFace],
      clip.CullMode                 = vk_to_gen_cullmode[rs_info->cullMode],
      clip.ClipEnable               = !(extra && extra->use_rectlist),
      clip.APIMode                  = APIMODE_OGL,
      clip.ViewportXYClipTestEnable = true,
      clip.ClipMode                 = CLIPMODE_NORMAL,

      clip.TriangleStripListProvokingVertexSelect   = 0,
      clip.LineStripListProvokingVertexSelect       = 0,
      clip.TriangleFanProvokingVertexSelect         = 1,

      clip.MinimumPointWidth        = 0.125,
      clip.MaximumPointWidth        = 255.875,
      clip.MaximumVPIndex = pCreateInfo->pViewportState->viewportCount - 1;
   }

   if (pCreateInfo->pMultisampleState &&
       pCreateInfo->pMultisampleState->rasterizationSamples > 1)
      anv_finishme("VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO");

   uint32_t samples = 1;
   uint32_t log2_samples = __builtin_ffs(samples) - 1;

   anv_batch_emit(&pipeline->batch, GENX(3DSTATE_MULTISAMPLE), ms) {
      ms.PixelLocation        = PIXLOC_CENTER;
      ms.NumberofMultisamples = log2_samples;
   }

   anv_batch_emit(&pipeline->batch, GENX(3DSTATE_SAMPLE_MASK), sm) {
      sm.SampleMask = 0xff;
   }

   const struct brw_vs_prog_data *vs_prog_data = get_vs_prog_data(pipeline);

#if 0 
   /* From gen7_vs_state.c */

   /**
    * From Graphics BSpec: 3D-Media-GPGPU Engine > 3D Pipeline Stages >
    * Geometry > Geometry Shader > State:
    *
    *     "Note: Because of corruption in IVB:GT2, software needs to flush the
    *     whole fixed function pipeline when the GS enable changes value in
    *     the 3DSTATE_GS."
    *
    * The hardware architects have clarified that in this context "flush the
    * whole fixed function pipeline" means to emit a PIPE_CONTROL with the "CS
    * Stall" bit set.
    */
   if (!brw->is_haswell && !brw->is_baytrail)
      gen7_emit_vs_workaround_flush(brw);
#endif

   if (pipeline->vs_vec4 == NO_KERNEL || (extra && extra->disable_vs))
      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_VS), vs);
   else
      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_VS), vs) {
         vs.KernelStartPointer         = pipeline->vs_vec4;
         vs.ScratchSpaceBaseOffset     = pipeline->scratch_start[MESA_SHADER_VERTEX];
         vs.PerThreadScratchSpace      = scratch_space(&vs_prog_data->base.base);

         vs.DispatchGRFStartRegisterforURBData    =
            vs_prog_data->base.base.dispatch_grf_start_reg;

         vs.VertexURBEntryReadLength   = vs_prog_data->base.urb_read_length;
         vs.VertexURBEntryReadOffset   = 0;
         vs.MaximumNumberofThreads     = device->info.max_vs_threads - 1;
         vs.StatisticsEnable           = true;
         vs.VSFunctionEnable           = true;
      }

   const struct brw_gs_prog_data *gs_prog_data = get_gs_prog_data(pipeline);

   if (pipeline->gs_kernel == NO_KERNEL || (extra && extra->disable_vs)) {
      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_GS), gs);
   } else {
      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_GS), gs) {
         gs.KernelStartPointer         = pipeline->gs_kernel;
         gs.ScratchSpaceBasePointer    = pipeline->scratch_start[MESA_SHADER_GEOMETRY];
         gs.PerThreadScratchSpace      = scratch_space(&gs_prog_data->base.base);

         gs.OutputVertexSize           = gs_prog_data->output_vertex_size_hwords * 2 - 1;
         gs.OutputTopology             = gs_prog_data->output_topology;
         gs.VertexURBEntryReadLength   = gs_prog_data->base.urb_read_length;
         gs.IncludeVertexHandles       = gs_prog_data->base.include_vue_handles;

         gs.DispatchGRFStartRegisterforURBData =
            gs_prog_data->base.base.dispatch_grf_start_reg;

         gs.MaximumNumberofThreads     = device->info.max_gs_threads - 1;
         /* This in the next dword on HSW. */
         gs.ControlDataFormat          = gs_prog_data->control_data_format;
         gs.ControlDataHeaderSize      = gs_prog_data->control_data_header_size_hwords;
         gs.InstanceControl            = MAX2(gs_prog_data->invocations, 1) - 1;
         gs.DispatchMode               = gs_prog_data->base.dispatch_mode;
         gs.GSStatisticsEnable         = true;
         gs.IncludePrimitiveID         = gs_prog_data->include_primitive_id;
#     if (GEN_IS_HASWELL)
         gs.ReorderMode                = REORDER_TRAILING;
#     else
         gs.ReorderEnable              = true;
#     endif
         gs.GSEnable                   = true;
      }
   }

   if (pipeline->ps_ksp0 == NO_KERNEL) {
      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_SBE), sbe);

      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_WM), wm) {
         wm.StatisticsEnable                    = true;
         wm.ThreadDispatchEnable                = false;
         wm.LineEndCapAntialiasingRegionWidth   = 0; /* 0.5 pixels */
         wm.LineAntialiasingRegionWidth         = 1; /* 1.0 pixels */
         wm.EarlyDepthStencilControl            = EDSC_NORMAL;
         wm.PointRasterizationRule              = RASTRULE_UPPER_RIGHT;
      }

      /* Even if no fragments are ever dispatched, the hardware hangs if we
       * don't at least set the maximum number of threads.
       */
      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_PS), ps) {
         ps.MaximumNumberofThreads = device->info.max_wm_threads - 1;
      }
   } else {
      const struct brw_wm_prog_data *wm_prog_data = get_wm_prog_data(pipeline);
      if (wm_prog_data->urb_setup[VARYING_SLOT_BFC0] != -1 ||
          wm_prog_data->urb_setup[VARYING_SLOT_BFC1] != -1)
         anv_finishme("two-sided color needs sbe swizzling setup");
      if (wm_prog_data->urb_setup[VARYING_SLOT_PRIMITIVE_ID] != -1)
         anv_finishme("primitive_id needs sbe swizzling setup");

      emit_3dstate_sbe(pipeline);

      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_PS), ps) {
         ps.KernelStartPointer0           = pipeline->ps_ksp0;
         ps.ScratchSpaceBasePointer       = pipeline->scratch_start[MESA_SHADER_FRAGMENT];
         ps.PerThreadScratchSpace         = scratch_space(&wm_prog_data->base);
         ps.MaximumNumberofThreads        = device->info.max_wm_threads - 1;
         ps.PushConstantEnable            = wm_prog_data->base.nr_params > 0;
         ps.AttributeEnable               = wm_prog_data->num_varying_inputs > 0;
         ps.oMaskPresenttoRenderTarget    = wm_prog_data->uses_omask;

         ps.RenderTargetFastClearEnable   = false;
         ps.DualSourceBlendEnable         = false;
         ps.RenderTargetResolveEnable     = false;

         ps.PositionXYOffsetSelect        = wm_prog_data->uses_pos_offset ?
                                            POSOFFSET_SAMPLE : POSOFFSET_NONE;

         ps._32PixelDispatchEnable        = false;
         ps._16PixelDispatchEnable        = pipeline->ps_simd16 != NO_KERNEL;
         ps._8PixelDispatchEnable         = pipeline->ps_simd8 != NO_KERNEL;

         ps.DispatchGRFStartRegisterforConstantSetupData0 = pipeline->ps_grf_start0,
         ps.DispatchGRFStartRegisterforConstantSetupData1 = 0,
         ps.DispatchGRFStartRegisterforConstantSetupData2 = pipeline->ps_grf_start2,

         /* Haswell requires the sample mask to be set in this packet as well as
          * in 3DSTATE_SAMPLE_MASK; the values should match. */
         /* _NEW_BUFFERS, _NEW_MULTISAMPLE */

         ps.KernelStartPointer1           = 0;
         ps.KernelStartPointer2           = pipeline->ps_ksp2;
      }

      /* FIXME-GEN7: This needs a lot more work, cf gen7 upload_wm_state(). */
      anv_batch_emit(&pipeline->batch, GENX(3DSTATE_WM), wm) {
         wm.StatisticsEnable                    = true;
         wm.ThreadDispatchEnable                = true;
         wm.LineEndCapAntialiasingRegionWidth   = 0; /* 0.5 pixels */
         wm.LineAntialiasingRegionWidth         = 1; /* 1.0 pixels */
         wm.EarlyDepthStencilControl            = EDSC_NORMAL;
         wm.PointRasterizationRule              = RASTRULE_UPPER_RIGHT;
         wm.PixelShaderComputedDepthMode        = wm_prog_data->computed_depth_mode;
         wm.PixelShaderUsesSourceDepth          = wm_prog_data->uses_src_depth;
         wm.PixelShaderUsesSourceW              = wm_prog_data->uses_src_w;
         wm.PixelShaderUsesInputCoverageMask    = wm_prog_data->uses_sample_mask;
         wm.BarycentricInterpolationMode        = wm_prog_data->barycentric_interp_modes;
      }
   }

   *pPipeline = anv_pipeline_to_handle(pipeline);

   return VK_SUCCESS;
}